相关疑难解决方法(0)

在我的应用程序中,我想在imageview上用手指画线.我希望输出如下:

在此屏幕中,fish是imageview,红线是绘制线条.所以我按照下面的链接开发应用程序 链接.这是我的代码:

public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.addphoto);

    btnAddPhoto=(Button)findViewById(R.id.add);
    btnEdit=(Button)findViewById(R.id.edit);
    imageView=(ImageView)findViewById(R.id.photo);

    btnAddPhoto.setOnClickListener(this);
    btnEdit.setOnClickListener(this);
    imageView.setOnTouchListener(this);         
}

    @Override
public void onWindowFocusChanged(boolean hasFocus){
    width=imageView.getWidth();
    height=imageView.getHeight();

    Log.e("heightttt",""+height);
    Log.e("Widthhhh",""+width);

}

    @Override
public void onClick(View v) {
    // TODO Auto-generated method stub
    if(v.equals(btnAddPhoto)){

        popup.setVisibility(View.VISIBLE);
    }

    if(v.equals(btnEdit)){
       bitmap = Bitmap.createBitmap((int) width, (int) height,Bitmap.Config.ARGB_8888);
        canvas = new Canvas(bitmap);
        paint = new Paint();
        paint.setColor(Color.BLACK);
        imageView.setImageBitmap(bitmap);
        imageView.setOnTouchListener(this);
    }
}

    public boolean onTouch(View v, MotionEvent event) {
        int action = event.getAction();
        switch (action) {
        case MotionEvent.ACTION_DOWN:
          downx = event.getX(); …